As far as primers go, in some cases there can be quite a huge difference in accuracy opportunity. Pretty much all the rifles I've experimented with the CCI BR2s in have loved them. CCI BR2 Primers in stock use specifically picked cups and anvils for added consistency. An impartial researcher https://z-ndh-tchen-small-rifle24567.ssnblog.com/30858041/not-known-details-about-cci-550